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Help with gray water discharge featured last week on Season 10, episode 17

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Help with gray water discharge featured last week on Season 10, episode 17

I want to install the same exact system that they did at this house in California last weekend, with one exception. I live in Harrisburg, Pennsylvania and I am not sure how to protect this line that will run from the washing machine to the garden beds form freezing. Our frost line is 42 inches and this line will be running above ground. Any ideas?